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. 2018 Nov 27;4(2):e000766. doi: 10.1136/rmdopen-2018-000766

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© Author(s) (or their employer(s)) 2018. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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Distribution of first and recurrent sick leave episodes over time in the study population at risk. No SL yet=those who are at risk for sick leave, but have not incurred any sick leave (yet). First SL=those who reported SL for the first time during follow-up, in the previous interval or before. Recurrent SL=those who reported SL for the second time during follow-up, in the previous interval or before. Censored=censored from analyses due to reasons of job loss, unemployment, work disability, retirement. Lost to follow-up=patients that were lost to follow-up. *Due to the design of OASIS (annual assessments until month 72, thereafter every 2 years), annual assessments were not always available for those who became at risk for SL during follow-up. AS, ankylosing spondylitis; LTFU, lost to follow-up; OASIS, Outcome in Ankylosing Spondylitis International Study; SL, ankylosing spondylitis-related sick leave.